Spark intensifier



Aug. 4, 1925.

o. L. PIERSALL SPARK INTENSIFIER Filed April 15, 1922 uvmvrog 7 05cm: L. Puma wz/ca,

ATTORNEYS.

Patented Aug. 4, 1925.

- 5 N D STA E ENT OFFICE,

osca'n Li rrnn'satt, or INDIANAPOLIS, INDIANA, AssIenoR- or ONE-HALF r J.

ings. and the RICHARD rnANcrs; or FLINT, MIcHIeAn, AND ONE-HALF COMPANY, on INDIANAPOLIS,INDIANA, A conronarron.

T0 UNITED MACHINE SPARK rlv'rnlvsrrrnn.

-Application filed April 15, 1922. Serial No. 553,125.

Toall whomtmay concern: Be it knownthat I, .OSGAR L. PIERSALL, .acitizen. otthe United States, anda resident of Indianapolis, county of Mario ngand State of Indiana, haveinvented a certain new and useful Spark Intensifier [and I I do hereby declare that the following is a full, .jclear, and exact description thereof, reference being hadto the accompanying drawings, inwhich .like numerals refer to like parts. 7 m H fi.This invention relates to a Spark intensi- The chief object of :this invention is, to construct a spark intensifier of'a minimum number of parts consistent with. the. function performed by :said intensifier;

The chief. feature of the invention is to construct anintensifier of but a minimum number ofparts which are so associated together thatshort circuiting of the terminals is .prevented,- and observation of the gap or spark is permitted whenever desired and protection jisf lfforded at all other times.

,.The;full v nature or the 'inventionwill be p understood from the accompanying drawfollowing description and claims. In the ,drawings,.Fig. :1 rs a side elevational view of the invention-showing the same in the; normal position, or protective position. Fig. 2 isa side elevational view taken at right angles to Fig. 1. Fig. 3 is a side elevational View similar to Fig. 1, but shows said parts in the observation position. Fig. 4 is a longitudinal sectional view taken on the line 4-4 of Fig. 2 and in the direction of the arrows. Fig. 5 is a transverse sectional view taken on the line 55 of Fig. 1 and in the direction of the arrows.

In the drawings 10 indicates a dielectric or insulation body, which herein is illustrated as cylindrical in form and provided with an axially aligned threaded opening 11 which extends through the body portion. Substantially intermediate the length of the body portion 10, there is formed a trans verse opening 12, and said transverse opening herein extends completely through the body portion and communicates with the axial opening 11. Extending intothe space at the junction of the two rectangularly positioned openings 11 and 12 is a pair of terminals 13 which are threaded and have a threaded engagement with the opening 11s1m1larly formed, so that said electrodes or termlnals 13 may be screwed into or re tracted from theposition shown in Fig. 4 V

by engaging the screw head 14 and turning the same.

I Eachof the terminals or. electrodes 13 supports a split or spring washer 15, and a nut 16 upon the terminal 13 looks terminals are secured in aligned and adusted position. 7 a The body portion lO is herein shown as provided with a transversely extending aligned opening 11 and the transverse opening 12. The opening 17, however, does not extend. completely through the body portion. Said opening 17 is adapted to receive anintermediate or transverse cross wire or electrode 18. The essential elements of the spark intensifier have thus been described.

The connection fromjthe usual spark coil 1s secured toone of .the'terminals 13, and preferably the upper one, by means of the split washer 19 and locking nut 20. Y A strap 2lis "aperturedat 22 for engagement with the usual spark'plug, and said strap- 21 is also apertured at 23 to receive the" other or lower terminal 13. A locking washer 24;

and a locking nut 25 secure the intensifier to the supporting strap 21, as shown in the several figures.

Another feature of the invention consists in the provision of a closure for the opening 12. The opening 12, it desire may terminate short of extending entirely through the body portion 10, and when so formed any simple closure may be positioned upon the body portion 10 adjacent the opening 12, and said closure may be pivoted above the opening, thereby being manually movable from the closing or protecting position into the observation position. Thus, the spark gap and the spark may be observed when the closure is moved out or registration with the opening 12. A dark background, therefore, is provided behind the sparking terminals, which makes them more prominent. Herein, however, a neater and simpler construction is provided for the same purpose but which operates in substantially the same .the terminal in theadjusted position in the opening 11. Thus the two electrodes or manner, Such means illustrated as a non-conducting or insulating shell: of sleeve 26, which shell or sleeve is provided with an opening 27. The sleeve 26- is preferably mounted for arcuate movement upon the;

the sleeve lon itudinally of thobody portion and movesthe opening 27 into registration with the opehing ia- The slot 28", as shown clearly inFig; 2, isflincl-ined for the foregoing" urpose. Said inclination is such that although the sleeve 2em'ey be m nuall turned and simultaneonsly' elevated until the openi g '27 registers with the openin 12', as shownin Fig; 3, the sleeve 26 will be automatically returned h'y gravity when rel'ea's'od from manual engagem nt. This movement is assisted by the vibration. of the engiiiif ,n

It will be observed that 7 although the opening l2is extended entirely through the body portion, the sleeve 26 as shown in Fig. 5, forms a back wall for the opening 12, and, therefore, fo ms a dark chamber which permits the terminals and the spark to be more readily observed. As shown clearly Fig, 3, the sleeve is movable longitudinally of the body portion as' well as: rotatable thereof. With the foregoing construction the danger of short cir'cuiting, ouoto tern-iinal caps or, the like en aging portions of the engine or other metalii c members, is

mm i ii somehoweliminated, Shae finffletallic 7 -member or engine although on aging one sleeve or of the terminals 13 will: en

bo y. 101ml be w the other termina 13v The invention claimed is:

aget mm engaging A spark intensifier including a body portion provided with two communicating openings; one or said openings extendi entirely through the bod portion, a pair 0 electrodes, each positioiie gitifided and tel niilifitifig" Within the Body portion adjacent the mm oaciori with s'ohi' other owing, a d

oeliy op ra-hie pivot'ell iiiounod dome means for o posing said other" opening turned one ahioio'otioeny e By gravity one the like @011 the release from marine engagement oioshi position: 1

' 2. A spark intensifier inc' u ir'ig a portion provided with two communicfafifig openings, one of serial opoeinge extending entirely through the body portion, a pair 6f electrodes eac'h positioned in a portion of the extended opehing one termihefin w portion adjacent the oommunication wit said other openhig, osleevo surrounding said bocy' portion Having a opening" therein a opted to re with the other opening, and a thir electrode within the bod positioned between said first-mentioned leetrodes and projecting outwardly Beyond the body portion, said Body portion inc nifiilg n inclined slot for r'eceivin' said project- 3 ing end of the third oiootro for; limitin movement thereof and; for insifrin'g'; matic' closure of thohody opening W efr the sleeve is released.

vIn witness whereof, i have lierennto affixed my signature. I OSCARL; PIEYtSALL; 

